5.1.82
द्विगोर्यप्
Operational rule vidhi
The affix यप् comes after the word मास when forming a द्विगु समास (Numeral Determinative Compound) and meaning 'age'.
Word by word (padaccheda)
Left context द्विगोः pañcamī · ekavacanaSubstitute / term यप् prathamā · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
द्विगोः यप्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix यप् comes after the word मास when forming a द्विगु समास (Numeral Determinative Compound) and meaning 'age'.
Thus द्वौ मासौ भूतः = द्विमास्यः, त्रिमास्यः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.